One of the things that has come out of the Television Critics Association press tour is that Fox is considering a segment of their 24 franchise without Kiefer Sutherland playing Jack Bauer. They have been pitched a follow up to 24: Live Another Day by executive producers Howard Gordon, Evan Katz and Manny Coto that would focus on the supporting characters from the series.
There is a point in the story where Bauer could come in and fit organically or they could go the whole installment without him. The idea is not to take Bauer out of the series all together, but just for the one segment. They have spoken with Sutherland who also serves as an executive producer on the show, but the network is still trying to decide if what makes 24 successful is the hour-by-hour format or Bauer.